World War I: Allied troops on the Gallipoli PeninsulaAllied troops lining the shore at "ANZAC Cove" on the Gallipoli Peninsula. The cove was named after the ANZAC (Australian and New Zealand Army Corps) troops that were part of the Allied forces. The Dardanelles Campaign against the Turks was a bloody defeat for the Allies. Hulton Archive/Getty Images

In World War II the chief Allied powers were Great Britain, France (except during the German occupation, 1940–44), the Soviet Union (after its entry in June 1941), the United States (after its entry on December 8, 1941), and China. More generally, the Allies included all the wartime members of the United Nations, the signatories to the Declaration of the United Nations. The original signers of January 1, 1942, were Australia, Belgium, Canada, China, Costa Rica, Cuba, Czechoslovakia, the Dominican Republic, El Salvador, Greece, Guatemala, Haiti, Honduras, India, Luxembourg, the Netherlands, New Zealand, Nicaragua, Norway, Panama, Poland, South Africa, the Soviet Union, the United Kingdom, the United States, and Yugoslavia. Subsequent wartime signers were (in chronological order) Mexico, the Philippines, Ethiopia, Iraq, Brazil, Bolivia, Iran, Colombia, Liberia, France, Ecuador, Peru, Chile, Paraguay, Venezuela, Uruguay, Turkey, Egypt, Syria, and Lebanon.